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Mathematics 73 Online
OpenStudy (anonymous):

the base of an isosceles triangle, 32 cm in length, lies in plane P. the plane containing the triangle forms a dihedral angle 45 degrees with plane P. If each of the congruent sides of the triangle measures 20 cm, find the distance from the third vertex to plane P and the length of the projection of the perimeter of the triangle on the plane.

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